Add model build CI for CABLE offline

Making CABLE available as a spack package allows us to test the model compiles
successfully inside a continuous integration (CI) environment which gets
triggered automatically on a pull request. This change adds the model build CI
workflow developed by the ACCESS-NRI release team to compile CABLE offline via
spack (see build-ci for more details). This workflow compiles CABLE using the
intel compiler. The CI for other compilers will follow after this pull request.

Fixes #202

.github/workflows/model-build-test-ci.yml

@@ -0,0 +1,15 @@
+name: Test model build
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - "master"
+
+jobs:
+  build:
+    name: Build ${{ github.repository }} via spack
+    uses: access-nri/build-ci/.github/workflows/model-1-build.yml@983fb50caaf0fe7e93bb3b13e09e81a7b846f7d1
+    permissions:
+      packages: read